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'''Clear/clean ESN''' :

A clear/clean ESN  indicates  that it is activated properly by the service provider. An unclear ESN refers to a phone that is either still activated, or lost/stolen. Providers will not activate a phone with a bad or unclear ESN. Stay away from those.

'''Unlocked phone''' :

If the phone gets free from SIM lock is known as unlocked phone .  SIM lock is also called as subsidy lock/NP lock/Country lock/Network lock.

'''Sim lock '''

It  indicates that the  current Network provider restricts our phone to use with other countries. For example: Consider you have an iPhone 4 which is locked to o2 UK . Unexpectedly, you want to switch over from UK to Australia . At that situation, your phone gets locked to particular network (o2). During that time, you need to unlock it to use your iPhone with Australia or other countries. You can get unlocking service from your Network provider/use factory unlocking method/get Remote unlocking method from any of the third-party service providers like  [http://www.theunlockspot.com/apple-iphone-4/rs10wp9/|Theunlockspot.com]   to unlock your iPhone 4.

Once, you gets unlocked from your carrier, you can easily switch over from your network to other GSM networks.

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